This paper deals with the analysis and role of the information system in the case of a network operator, which is of crucial importance in the modern telecommunications industry. The information system of a network operator encompasses a wide range of components, including network infrastructure, software applications, databases, and user interfaces. This analysis explores how each of these elements contributes to efficient network management and service provision to users. The network infrastructure enables the physical connectivity and communication within the network, while software applications facilitate monitoring, management, and control of the network. Special attention is also given to the role of the information system in data collection, analysis, and processing. This aspect is of paramount importance as it enables the network operator to make informed decisions, identify trends and patterns, and optimize its business processes. Furthermore, the information system plays a crucial role in the security and protection of the network operator. Information system security is vital to ensure the confidentiality, integrity, and availability of data. This includes protection against unauthorized access, attacks, and misuse. The network operator must implement technical measures such as firewalls, data encryption, and authentication to secure its systems. It is also important to have security management procedures in place, including employee training on security procedures and responses to incidents. Such a comprehensive approach to security helps protect the information systems of the network operator from potential threats and vulnerabilities. Overall, the information system of a network operator is a fundamental part of their operations and essential for providing high-quality telecommunications services. The security and protection of these systems are of utmost importance to preserve the reliability and trust of users.